Did FB for a number of years and I unfriended a few for over the top political or incessant/inane social posting. These folks just took over my newsfeed so I had to hide or unfriend them.
A few years after joining I got "outed" by my high school class (they found me and then it seemed almost the entire class wanted to friend me). I pretty much said yes to all, but felt weird because there were a lot that I had little or nothing in common with back then, so why have my stuff thrown out there--as if we were in high school again.
I don't know exactly what went on, but my actual best friends through high school/college were slow to get on board and when they did a few years later they ignored my friend requests. And a wife of one friend unfriended me at some point. I deactivated my account over a year ago and kind of no longer want people from my past to look me up. And that includes former good friends. Seems a little empty but time to move on I guess.
Now I have few real friends and just troll the trolls here, or at least let them know when they are being really stupid.